Stress can make your back ache, because stress can cause your muscles to tense and tighten, which causes pain. I like your name, btw :D
Yes, stress can cause you to hurt. You may want to see a doctor about your back you may of pulled something in your back
I am no expert but serious stress can cause a ton of problems, including life-threatening ones.
Mmmm probably it can make alot of things ache.